Campoamor Stursberg, Otto-Rudwig2023-06-202023-06-2020060305-447010.1088/0305-4470/39/44/C01https://hdl.handle.net/20.500.14352/50686The author would like to correct some inaccuracy in formula (6), concerning the contraction of Casimir operators, which is wrong in the stated form. Let g � g� be a nontrivial contraction. Without loss of generality we can suppose that the contraction is given, over some basis, by a transformation of the type [1]engjournal articlehttps//doi.org/https//doi.org/10.1088/0305-4470/39/44/C01restricted access512Álgebra1201 Álgebra